Shell DEP 30.48.00.31-Gen PROTECTIVE COATINGS FOR ONSHORE AND OFFSHORE FACILITIES

[mike mufdi]

The DEP 30.48.00.31-Gen article 5.4 reads :
"5.3 COMPATIBILITY WITH EXISTING COATING SYSTEMS:
Before any painting work is commenced, the compatibility with existing coating systems or
layers shall be checked. The paint Manufacturer shall be consulted. If there is any doubt
about compatibility, the patch test in accordance with ASTM D5064 shall be conducted to
evaluate the inter-coat adhesion. For new construction, modifications and areas under
renovation, [highlight #FCE94F]all coating materials in a coating system shall be made by the same
Manufacturer[/highlight]."
Does this means all the project should use one manufacturer even if the project scale is big and one supplier can not commit to the full quantity?
We have this situation where paint system is supplied from one manufacturer that is failing to cope up with the requirements, so contractor is proposing to use another manufacturer of the same paint system, but quality team is rejecting and depending on the above paragraph to justify their stand . Note, MAR and PQT of new manufacturer is approved by client.

 

[3DDave]

I think it means that if there is a pre-treat, a primer, and then a top-coat, that all three come from the same supplier. An exception would be if the supplier suggested pre-treat is some generic/specified chemical commonly available.

I would not expect that neighboring areas would have to be the same maker, but there will be areas where the two would overlap, leaving the question of how to deal with potentially incompatible finish systems.

OTOH, once an area is finished it is then an "existing" coating system and should fall under the first part and be dealt with as suggested.

Even so, it's best not to mix them across the structure unless care is taken to document where each is used. In the event of coating failure it will be necessary to determine which one to avoid. Of course, there may also be legal issues which are beyond the engineering considerations. For certain mixed use of pretreatment, primer, and top coat will allow most any maker to avoid all responsibility and I have little doubt that testing exists to confirm if that has been done.